1. Groundwater David R. Maidment CE 394K.2 Spring 2005 Reading: Handbook of Hydrology, Chapter 6, Sec 6.1 to 6.7

2. Groundwater Investigation Can’t “see” groundwater so a lot more is done by inference and interpretation than for surface water Site investigation –Conceptual model of geological environment and the flow system through it –Field measurements (bore holes, pump tests, geophysics) –Hydrogeologic simulation model (e.g. Modflow)

3. Groundwater Investigation Figure 6.1.1

4. Geological Time Scale

6. Comal and San Marcos Springs are the major outflow points for the “Southern Segment” of the Edwards Aquifer

7. Barton Springs Segment of Edwards Aquifer http://www.bseacd.org/geology.html

8. Geological Evolution http://www.edwardsaquifer.net/geology.html

9. Hydrogeology of Aquifer http://www.bseacd.org/hydrogeology.html

10. Karst terrain – caves, sinkholes and underground streams http://www.bseacd.org/karst.html

11. Flow in Barton Springs 2001 2000 200220032004 http://www.bseacd.org/cc_water_levels.html

12. Piezometric Head Map Tucson, Az. Figure 6.3.2

13. Monitoring Points Buda Dowell Negley Lovelady Barton Springs (surface water) Well Stream gage

14. Piezometric Head Level Depth from the ground surface Elevation head Pressure head Piezometric head

15. http://www.bseacd.org/cc_water_levels.html 200220032004 Buda

16. Piezometric head in monitoring wells Dowell Monitoring Well 2002 20032004 20032004 Buda Dowell Buda Monitoring Well

17. Equipotential Lines and Flow q = K dh/dx Figure 6.3.5

18. Flow Net Figure 6.4.1